31693331 has 4 divisors (see below), whose sum is σ = 31708200. Its totient is φ = 31678464.

The previous prime is 31693327. The next prime is 31693339. The reversal of 31693331 is 13339613.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31693331 - 2² = 31693327 is a prime.

It is a super-2 number, since 2×31693331² = 2008934459751122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31693294 and 31693303.

It is not an unprimeable number, because it can be changed into a prime (31693339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (7927050).

Almost surely, 2^31693331 is an apocalyptic number.

31693331 is a deficient number, since it is larger than the sum of its proper divisors (14869).

31693331 is a wasteful number, since it uses less digits than its factorization.

31693331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14868.

The product of its digits is 4374, while the sum is 29.

The square root of 31693331 is about 5629.6830283774. The cubic root of 31693331 is about 316.4627726546.

The spelling of 31693331 in words is "thirty-one million, six hundred ninety-three thousand, three hundred thirty-one".